Method of testing electkic lamp globes



(No Model.)

O. P. REINM'ANN.

METHOD OF TESTING ELEOTRIU LAMP GLOBES. No. 374,850; I Patented Dec.13,1887.

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' UNITED STATES PATENT OFFICE.

CHARLES E. REINMANN, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THEWESTINGHOUSE ELECTRIC COMPANY, OF SAME PLACE.

METHOD OF TESTING ELECTRIC-LAMP. GLOBES.

SPECIFICATION forming part of Letters Patent No. 374,850, dated December13, 1887.

Application filed October I, 1887. Serial No. 251,187.- (No model.)

To all whom it may concern.-

Be it known that LCHARLEs F. REINMANN, a citizen of the United States,residing at Pittsburg, in the county of Allegheny, iu the State ofPennsylvania, have invented certain new and useful Improvements in theMethod of Testing Electric-Lamp Globes, of which the following is aspecification.

The invention relates to a method of preparingincandescent-electric-lamp globes for the purpose of exhausting the airtherefrom.

The object of the invention is. to-provide a convenient method fordetermining whether or not the lamps are hermetically sealed to the forkor tube through which they are exhausted.

The invention consists in placing thelampbulbs and the fork, to whichthey are temporarily sealed, in a tank of water or other liquid andconnecting the fork with a source of gas or air under pressure. If thereis a leak at any of thejoints or in any ofthe globes, the air or gaswill escape therethrough and rise to the surface of the water in theform of bubbles, thus indicating that there is a leakage and the pointat which it takes place.

In the accompanying drawing there is shown a set of lamps placed in atank for carrying out the operation.

Referring to the drawing, A represents a tank containing water or otherfluid, as indicated at B. The lamp-globesD D are sealed to the fingers ccot the fork C. This fork consists of a central tube, a, from which thetubes 0 radiate. The tubes 0 open into the tubes d at the. ends of thelamp-globes in a manner 5 well understood. The central tube is connectedby a rubber tube or in any other convenient manner with a gas-pipe, E,or any other suitable supply of gas or compressed air. After the fork isthus connected the stop-cook 0 6 may be opened and the fork and theattached lamps placed beneath the surface of the water.

In case there is an imperfectjoint or an opening in any of the globes orthe necks of'the same it will become evident by the 'gas pass- 5 ingthrough and escaping .to the surface of the water.

It is evident that this process may be carried out without in any mannerinjuring the filaments ofthelamps or permittingthe water 50 to enter theglobes.

I claim as my invention The hereinbeforedescribed process of testinglamp globes previous to their exhaustion,whieh consists in placing them,after they '55 are attached to their supporting -forks, beneath thesurface of aliquid, and in forcing air or gas under pressure into thesame and noting whether or not the air or gas escapes through theliquid. 60

In testimony whereof I have hereunto subscribed 'my name this 15th dayof September,

CHARLES .F. REIN MANN.

. Witnesses! W. D. UPTEGRAFF, DANL. W. EDeEooMB.

